## Electromagnetic Induction Quiz-2

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q11. A step-down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and its efficiency is 88%. The input current is
•  4.65 mA
•  0.045 A
•  0.45 A
•  4.65 A
Solution

Q12.A conducting wire is dropped along east-west direction, then
•  No emf is induced
•  No induced current flows
•  Induced current flows from west to east
•  Induced current flows from east to west
Solution
Induced current flows from west to east

Q13.  Lenz’s law is expressed by the following formula (here e= induced e.m.f., Ï•= magnetic flux in one turn and N= number of turns)
•   e=-Ï• dN/dt
•  e=-N dÏ•/dt
•  e=-d/dt (Ï•/N)
•  e=N dÏ•/dt
Solution
e=-N dÏ•/dt

Q14. In the circuit shown below, the ac source has voltage V=20 cos⁡(Ï‰t) volts with Ï‰=2000 rad/sec. The amplitude of the current will be nearest to
•  First clockwise then anticlockwise
•  In clockwise direction
•  In anticlockwise direction
•  First anticlockwise then clockwise
Solution

Q15.A motor having an armature of resistance 2Î© is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210 V. When the motor is running at full speed, the current in the armature is
•  5A
•  105A
•  110A
•  215A
Solution

Q16. Two circuits have coefficient of mutual induction of 0.09 henry. Average e.m.f. induced in the secondary by a change of current from 0 to 20 ampere in 0.006 second in the primary will be
•  120 V
• 80 V
•  200 V
•  300 V
Solution

Q17.The time constant of an LR circuit represents the time in which the current in the circuit
•  Reaches a value equal to about 37% of its final value
•  Reaches a value equal to about 63% of its final value
•  Attains a constant value
•  Attains 50% of the constant value
Solution
Reaches a value equal to about 63% of its final value

Q18.The average power dissipation in pure inductance is
•  Ï€rB(dr/dt)
•  2Ï€rB(dr/dt)
•  Ï€r2 (dB/dt)
•  ((Ï€r2)/2)B(dr/dt)
Solution

Q19.The current (I) in the inductance is varying with time according to the plot shown in figure

Which one of the following is the correct variation of voltage with time in the coil

•

•

•

•

Solution

Q20. A transformer has 100 turns in the primary coil and carries 8 A current. If input power is one kilowatt, the number of turns required in the secondary coil to have 500V output will be
•  100
•  200
•  400
• 300
Solution

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